As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING SIGHTSEEING FLIGHT, PILOT EXPERIENCED AN ENGINE CHIP WARNING ILLUMINATION AND MADE PRECAUTIONARY LANDING. UPON FURTHER EXAMINATION, MECHANIC DETERMINED THERE WAS SUFFICIENT METAL CONTENT ON MAGNETIC PLUG TO CEASE FURTHER FLIGHT UNTIL CORRECTIVE ACTION TAKEN. ENGINE ASSY REMOVED AND REPLACED WITH SERVICEABLE UNIT.